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posted by  Ziggis on 10/22/2009 5:39:54 PM  |  status: Closed  |  Earned Karma: 50

Estimating a population mean: mean is known

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Statistics and Probability Elementary Statistics, 11th edition by MarioTriola 7 N/A 10/22/2009 at 9:00:00 PM
Question Details:
  Instruction to question: Find the indicated sample size
  Question: Sample size for white blood cell count: what sample size is needed to estimate the mean white blood cell count ( in cells per microlitre) for the population of adults in the UnitedStates? Assume that you want 99% confidence that the sample mean is within 0.2 of the population mean.The population standard deviation is 2.5
Please i need help with this question.Step-step working please.
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posted by Jonpp on 10/22/2009 6:50:26 PM  |  status: Live
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α=0.01, Z(0.005)=2.58 (check normal table)
σ=2.5


Take n=1041.
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posted by Ziggis on 10/22/2009 8:53:37 PM  |  status: Live
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Thank you so much for helping me out.
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